Key path “file:///app/config/jwt/public.pem” does not exist or is not readable
how do i solve this?
By adjusting the file owner of your shopware installation according to the system you are using. The key needs 0600 permissions and the Webserver needs access to it. Changing the owner of the files to the one that runs the webserver should be sufficient.
chown application:application /app/config/jwt/p* for everone that wants to copy&paste 
Well, this suggestions are perfect but not working. I can neither change attributes nor owner of files or folder. I am in the container with root rights! So any other suggestions?
The directory jwt has not set the x flag by default.
chmod +x config/jwt
solved it in my case.